Arrangement for cleaning filters of fabric



G5. sErrz ARRANGEMENT Fon CLANING FILTERS oF FABRIC Fld March 15 v f M Patented July 22, 1924.

UNMED STATES GormHrLr snrrz, or rRANKFoaT-oN-THE-MAIN,GERMANY.

ARRANGEMENT FOR CLEANING FILTERS O'F FABRIC.

Application filed March 13, 1924. i Serial No. 698,990.

To all whoft t may concern Be it known that I, GOTTHILF Snrrz, a citizen of the German Republic, residing at Frankfort-on-the-Main, Germany, have in# vented certain new and useful Improvements in Arrangements for Cleaning Filters of Fabric, of which the following is a specification.

ln filters of known type which have filtering surfaces of fabric or in filters of similar' type for the cleaning of air, gases or the like, and especially in filters wherein the filtering surfaces are of tubular shape, that is open at the lower end and fixed in the filter bottom, the upper end being closed by a lid suspended to a suspension comprising an agitating mechanism, the dust is removed either by slowly lifting the loose filter bags and by letting them dropsuddenly or by slowly lowering the filter bags which are stretched with the aid of a spring, a weight or the like, and then by suddenly returning the filter bags into the stretched position.

Both cleaning methods have their advan4 tagesand disadvantages and therefore it has been proposed to combine the two methods to thus preserve the advantages ofthe two methods and at the same time to neutralize the disadvantages of the one method by those of the other method. The simul taneous application of the two cleaning methods was however found to be too eX- pensive owing to the arrangements which were necessary to execute the various inovements and especially to communicate to the filter bags the particular vibrations, movements and shocks which was necessary to cleaning.

This problem is solved according to the present invention by the use of a spring and a weight or the like which produce the particular' vibrations and the movements and shocks and which are completev in themselves.

An embodiment of the invention is shown by way of example on the accompanying drawing in which each of the three figures is a cross section of the cleaning mechanism in different operating positions.

One or several filtering surfaces, for instance bags a are suspended to a horizontal rod b, the vertical pull rod c of which has a circular abutment al guided in a sleeve e. 0n the sleeve e a spring f is, mounted which acts against a disk g fixed on the upper end of rod c. A pawl 7L is pivotally mounted on the sleeve e. During the filtering the mechanism is in the position shown in Fig. 3 which is the position after the suction or pressure during the cleaning has beenshut off; ln order to clean the filter bags the sleeve e isy raised bymeans of camz' and.- lever lc until the pawl 7L rests on the abutment l (Fig. l). At the moment when the cam releases the lever 7c the sleevey e and all the elements connected with it including the lter bags drops until abutment d strikes upon a stationary member l (F ig. 2) which may be movable, or resilient, so that a vibratory shaking of the filtering surfaces is proe duced and the dust adhering thereto is thus forced to drop off. Through the intermediary of a convenient device such as a cam a the pawl it is released at this moment by the drive which operates the cam t', by means of a belt o, whereupon the filter bags are raised again by the action of the spring f. This cleaning may be repeated as fre-f quently as desired. It is evident that the spring could be arranged in another manner as shown provided it be placed under tension by the dropping of the filter bags so that as soon as the filter ba s are released again the spring causes the su den raising of the filter bags.

I claim l. In combination with a fabric filter, a cleaning device comprising a rod secured at one end to said filter; an abutment on said rod; a sleeve slidably mounted on said rod and said abutment; a spring provided on said rod at the free endthereof and adapted to abut against said sleeve; a pawl on said sleeve; and means operative to raise said sleeve against the force of said spring into its locked position by means of the pawl and the abutment, and then releaseV it to allow said filter to drop whereby the filter will be raised by the action of the spring.

2. In combination with a fabric filter, a cleaning device comprising a rod secured at one end to said filter; a sleeve slidably mounted on said rod; a spring provided on said rod at the free end thereof and adapted to abut against said sleeve; means for holding the sleeve in a locked position; and means operative to raise said sleeve against the force of said spring into said locked position and lthen release it to allow said filter to drop so that the filter will be raised by the action of said spring.

3. In combination with a fabric filter, a cleaning device comprising a rod secured at 4one :jen Tabl'itlnent iixedf on saidy rod; a sleeve slid- 'ablynounted'on said rod; a spring proone .end tojsaid filter;` a sleeve islidably mounted on saidffrod; means for holding the sleeve'in a looked position relative to said rod; means Yfor raising said sleeve into said looked positionfand for releasing said sleeve Vto allow said ltertojdrop; andrneans for raisin said iilter to its norinal position.

4. n combinction` with` a 'fabric filter, a oleanin device comprising a rod secured at to' a plrality `ofl filter bags; an

vided ontheifree end'of said rod and adaptef' abut "at einem@ 'Oe Said Sleeve; a

e z f y 502,464

pawl on saidsleeve adapted to abut on said abutmenton the rod to secure said sleeve in looked position; and means operative to raise said sleeve against the force of said spring into said looked position, and then to release saidsleeve to allow said filter bags to drop whereby said bags will be raised by the action of the spring. Y In testimony whereof I afix my signature in presence of two witnesses. GOTTHILF SIEITZ. Witnesses: i i

GABRIELE FLESCH, YJann Gnsrr. 

